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"Lumos." The professor said casting an illumination charm that made his wand admit a beam of light like a flashlight. It revealed a tall figure in a black cloak standing at the doorway. It reached out with a hand that looked decayed and long dead to open the compartment door. As it entered it seemed to suck in a deep breath.
Harry felt the chill around him deepen and sink into his bones. He also felt something being drawn out of him. He looked with his psychic sight and saw gray wisps of memory and emotion flowing out of the people in the compartment towards the shadowy figure. It was eating their experiences, feeding off their happiness and joy. Harry felt violated, Esharry felt angry. Then the thing breathed out and dark waves of energy left it.
When they touched Harry they sank into his mind, resonated with his darkest thoughts, emotions and memories making Harry feel miserable and afraid. Even worse, though Harry didn't know it at the time, this pulse of dark psychic power tripped a trauma response in his brain and called the darkest thing he had ever experienced to the forefront of his mind.
He felt a dark overwhelming terror approaching him and heard a baby crying and a distant woman screaming indistinctly. He couldn't handle it all and tried to retreat deep into his own head. His consciousness closed itself off from all experience and if he had been alone inside of his head he would've passed out.
Instead Esharry found himself in control of their body and he was furious. How dare this lesser life form to try and feed off their psychic energy?! How dare it think its own power was anything in comparison to his own?! How dare it endanger his friends?!
Esharry gathered up as much of his and Harry's power as he could muster and control. He channeled it through the front most part of his brain where he could fill it with his hate, anger and his determination to make this creature submit. Then he unleashed it all in a single wave of psychic violence and furry.
The creature was taken completely by surprise with this telepathic back blast. It was an apex predator in many respects, one of the most dangerous psychic things to be found in this world. Only wizards could resist their hunger and the best they could manage was to hold its kind at bay. It had never had to sharpen its own telepathic powers into this kind of a weapon. It was a wolf that suddenly found itself in the presence of a tiger and it had no way of protecting itself.
The creature wasn't instantly killed by the attack, much to Esharry's annoyance, but it obviously was stunned and could do nothing but hover in place. Esharry prepared a follow up strike with a telekinetic hit, since that wouldn't be as demanding on his psychic power. But since the thing was stunned its power in the room faded and the trauma response it had forced to activate in Harry's mind faded with so his mind began to reassert control over his body. Esharry didn't try to stop him but the transition to a still reforming will caused them to stumble and collapse to his knees.
"No one here is Sirius Black! Get back! Get back!" Professor Lupin ordered as he advanced on the creature. But it couldn't respond since it was still stunned from Esharry's attack. So Lupin raised his wand and cast a spell: "Expecto Patronum!"
A very large white dog shot from the professor's wand and leapt at the creature. At first it just crashed into the robed figure as if it expected it to fall back and run from it. When the creature barely reacted other than to briefly shriek in pain, the white dog, actually now that Harry got a good look at it that dog looked more like a wolf really, rebounded from the collision. The next time the spell lunged at the creature it leapt at its throat and sank its teeth into the hood.
The thing shrieked in pain, lashed out with wildly flailing limbs and gradually sank to the ground. Harry realized that whatever was within that cloak was gradually shrinking down. The spell that held it also sank somewhat, but nowhere near as quickly. Eventually the cloak folded on to the ground empty and dead. The white dog, or perhaps the shining wolf, glanced around as if looking for more prey before it returned to Lupin's side and vanished.
"So prolonged contact with a patronus can kill a dementor." The professor commented. "I hadn't known that. Here take this chocolate," he added, handing a bar of the stuff to Hermione. "Eating some is the best way to recover from a dementor attack, someone help Harry back into his seat, dementors have a far worse effect on those who already have terrible memories for them to exploit. I'm going to have a look around and make sure there are no more on the train. Don't touch that cloak."
Ron and Nevil got Harry back onto his seat while Hermione broke off some chunks of chocolate and handed them around. Harry ate his gratefully and it did indeed make him feel better. He was a bit dazed and confused by everything."What happened?" He asked.
"I was hoping to ask you that." Ron responded.
"Why would I know that? I think I fainted." Harry shot back. "I heard a woman screaming after the room went so chilly and I don't remember much after that."
"Well you did something mate." Ron affirmed. "All I saw was some kind of purple wave launched out of you that struck that thing and knocked it for a loop. I don't know what you did but it stopped affecting us all after that. What even was that thing?"
"Professor Lupin called it a dementor." Hermione noted.
"I read about them in our new defense textbook." Harry said which made everyone turn to look at him in stunned disbelief. Hermione was the one who usually read ahead in the school books, not Harry. Harry continued: "Nasty things. A kind of demon that eats happiness. I think they use them as guards at Azkaban prison. That must've been the patronus charm Professor Lupin used to drive it off."
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